talking-head-videolisted

# Talking-Head Explainer Video Build a finished 口播 video (vertical 9:16 by default, landscape 16:9 fully supported — see 画幅 section) where the speaker is full-frame by default, and during each explanation beat the speaker shrinks into a **circular avatar in the top-left** while an **animated knowledge graphic** (chart / data cards / comparison / flow / big-number) fills the screen. Subtitles are burned in and corrected against the user's verbatim script. This skill captures a real working pipeline. Read this whole file first, then the references as needed. The design conventions exist for concrete reasons — keep them unless the user asks otherwise. ## The core idea (why it's built this way) The **original talking-head video is the spine** — its audio plays untouched the whole time, so sync is never an issue. You only *overlay* graphics + a shrunk avatar during "knowledge windows"; everywhere else it's just the full face. The graphics render as **ProRes 4444 (alpha)** with a short fade at their edges, so they **crossfade onto the face** instead of cutting to black. ``` full face ──┐ ┌── graphic full-frame + avatar top-left ──┐ ┌── full face │ cross │ (one "knowledge window") │ cross │ subtitles burned over EVERYTHING, the whole time ``` ## Prerequisites (check / install once) - **ffmpeg** with libass + prores_ks (Homebrew ffmpeg has these) - **faster-whisper**: `python3 -m pip install faster-whisper` - **Node + Remotion*